Li Ziying, project leader and President of Beijing Institute of geology of nuclear industry, told reporters on October 9 that this discovery has pushed the discovery depth of industrial uranium mineralization in China from about 1000 meters to more than 500 meters. In 1789, M. H. kraprout discovered uranium from the German uranium deposit and named it uranium with the element symbol U. < p > < p > Li Ziying told reporters that uranium, as a particularly active element, can combine with many elements to form minerals. There are more than 300 kinds of uranides found in nature, some of which are particularly easy to oxidize to form new minerals, and their colors are more bright after being exposed to the wind and sun. At the end of the 19th century and the beginning of the 20th century, many buildings in Europe also used it as decoration materials. < / P > < p > even now, uranium glass is still respected by many players. Uranium glass is a kind of glass product. A kind of green fluorescence will be produced by adding a kind of green glass or uranium salt in the molten water. Under natural light, the surface of glass will show greasy feeling, so it is also called Vaseline Glass. In 1938, O. Hahn and f. Strassman bombarded uranium nucleus with neutrons, and discovered that nuclear fission released energy at the same time, which aroused people’s attention to uranium again. In 1946, Qian Sanqiang, a famous physicist in China, and his wife he Zehui discovered the phenomenon of “three splitting” and “four splitting” of uranium nucleus, which caused strong repercussions in the world scientific community. During and after the Second World War, Qian Sanqiang and his wife he Zehui discovered the phenomenon of “three splitting” and “four splitting” of uranium nucleus, Due to the need of nuclear weapons and nuclear power, the exploration and exploitation of uranium resources have been accelerated. < / P > < p > natural uranium mainly contains uranium 238 and uranium 235, which are uranium isotopes with half lives of 4.468 billion years and 704 million years respectively. In the process of their decay, uranium ore will release α – ray, β – ray and γ – ray, the most important of which is α – ray. < / P > < p > compared with the most dangerous gamma rays, alpha rays have the weakest penetration, which can be blocked by a piece of paper. However, protection measures should be taken in uranium mining. Because the uranium mine is sealed when it is buried underground, a lot of radioactive radon gas has accumulated for many years, which is produced by uranium decay. The half-life of radon is only 3.8235 days. A large amount of radon accumulated in uranium mines is very dangerous, and people’s health will be damaged after inhaling it. < / P > < p > uranium is active and likes to “make friends”. For example, when encountering carbon silicon mud, it is enriched in carbon silicon mud, and its content in various rocks is very uneven. Because of this, although uranium is widely distributed, the distribution of uranium deposits is very limited, mainly distributed in Central Asia, Australia, Canada, South Africa, Southwest Africa, Russia, the United States and other countries and regions. < / P > < p > in daily life, it is difficult for people to directly contact with uranium mineral raw materials. Because the content of uranium in uranium deposits is very low, the average content of uranium in the crust is about 2.5 parts per million, that is, about 2.5 grams of uranium per ton of crustal material. In other words, it’s no different from gold panning. According to the current ore classification standard in China, if the uranium content in hard rock (granite, volcanic rock) is higher than 0.05%, and that in sandstone is higher than 0.01%, it can be called industrial uranium mineralization. Li Ziying told reporters that according to the types of ore bearing rocks, China’s uranium resources are mainly divided into four types, namely granite type, volcanic rock type, sandstone type and carbonaceous siliceous mudstone type, and the first two are hydrothermal type uranium deposits. These two kinds of uranium deposits are mainly distributed in the south of China. How are uranium deposits formed? Generally speaking, it is enriched enough to develop under suitable environmental conditions through specific geological processes. For hydrothermal uranium deposits, the traditional theory holds that uranium comes from near surface, the fluid of uranium migration is surface water, and the ore-forming process is controlled by oxidation-reduction. However, Li Ziying’s team has put forward the “hot spot uranium mineralization theory” after long-term research. They believe that uranium elements and ore-forming fluids come from the deep part of the earth, and the changes of physical and chemical conditions when the uranium ore-forming fluid rises to the near surface lead to the precipitation and enrichment of uranium. This activity can take place as far as 3 km from the surface. If we go deeper, the physical and chemical conditions in the deep part of the earth are not conducive to uranium mineralization. This theory points out a new direction for finding uranium deposits. < / P > < p > in addition to carrying out indoor work according to the previous data, the more important thing is to “go out to the field” to check whether there are favorable geological structures, whether there is the role of ore-forming fluids, whether there are mineralization indications or anomalies. For good signs, we should also collect samples and go back to the laboratory for identification and analysis, or to determine when they were formed. In the eyes of geologists, it is very important to collect samples The head is alive. Experienced geologists, from the exposed rocks in the field, can see whether the ore-forming gateway can be found by naked eyes. It is said that it is difficult to enter the earth. For the invisible deep changes of the earth, we need to narrow the scope in a large area by means of geology, geophysics, geochemistry, aerial survey and remote sensing, so as to find the possible metallogenic prospect area. For example, it’s like a doctor finding out the abnormal indicators of the body and the location or cause of the disease through fluoroscopy, blood test and other methods. < p > < p > Li Ziying said that his project team spent more than two years investigating a large amount of data, and carried out comprehensive research on geology, geophysics, geochemistry, three-dimensional modeling and prediction in the study area. Their work area has shrunk from the initial area of tens of thousands of square kilometers to a CD-ROM size drilling position in Zhuguang area of Nanling. The whole process is a bit like looking for a needle in a haystack, but they have still done it. < / P > < p > deep drilling is the verification means of metallogenic theory and prediction technology and model. The two complement each other, which can provide the basis for opening up deeper prospecting space and improve the depth and accuracy of exploration. With the support of the key R & D project of “deep exploration technology demonstration of hydrothermal uranium base in South China” of the Ministry of science and technology, the borehole named “Changjiang No.1” was drilled in Zhuguang area of Nanling. When the drilling depth reaches 1484m, industrial grade uranium mineralization is still found. However, the team is faced with a new choice, which is whether to finish drilling 1500 meters according to the project design or to continue to drill. At the critical moment, Li Ziying continued to drill deeply according to core observation and research. Surprisingly, industrial uranium mineralization was also found at 1550m depth. In addition, several uranium mineralizations have been found at depths of 1560m, 1606m and 1696m, which indicates that there is still metallogenic potential in the deeper part. “If you play one meter shallow, you may not find anything like this.” Li Ziying said. The straight-line distance between the drilling location and the existing CNNC Shaoguan Jinyuan uranium industry Co., Ltd. is about 4km, Li Ziying said. According to the current single hole drilling situation, it is not easy to judge whether the two are in the same metallogenic belt, and subsequent intensive investigation is needed. With the discovery of uranium deposits going deep, it is inevitable that the mining cost will be further increased. In Li Ziying’s view, whether to dig deeper depends on the demand for mineral resources. Take Germany as an example, the depth of uranium mining has reached nearly 2000 meters. In Li Ziying’s opinion, the discovery of 1550m deep industrial uranium ore section provides a direct basis for Zhuguang and China to open up the second prospecting space, and further verifies the “hot spot uranium mineralization theory” and the effectiveness of deep exploration technology, which improves the exploration depth and accuracy, and is of great significance to China’s uranium prospecting and potential assessment. Global Tech